private async Task InitTextRecognizer(System.Net.DownloadProgressChangedEventHandler onDownloadProgressChanged = null)
#endif
{
if (_ocr == null)
{
FileDownloadManager manager = new FileDownloadManager();
manager.AddFile(
"https://github.com/emgucv/models/raw/master/scene_text/crnn_cs_CN.onnx",
_modelFolderName,
"C760BF82D684B87DFABB288E6C0F92D41A8CD6C1780661CA2C3CD10C2065A9BA");
manager.AddFile(
"https://github.com/emgucv/models/raw/master/scene_text/alphabet_3944.txt",
_modelFolderName,
"8027C9832D86764FECCD9BDD8974829C86994617E5787F178ED97DB2BDA1481A");
manager.OnDownloadProgressChanged += onDownloadProgressChanged;
#if UNITY_EDITOR || UNITY_IOS || UNITY_ANDROID || UNITY_STANDALONE || UNITY_WEBGL
yield return(manager.Download());
#else
await manager.Download();
#endif
if (manager.AllFilesDownloaded)
{
_ocr = new TextRecognitionModel(manager.Files[0].LocalFile);
_ocr.DecodeType = "CTC-greedy";
String[] vocab = File.ReadAllLines(manager.Files[1].LocalFile);
_ocr.Vocabulary = vocab;
_ocr.SetInputScale(1.0 / 127.5);
_ocr.SetInputMean(new MCvScalar(127.5, 127.5, 127.5));
_ocr.SetInputSize(new Size(100, 32));
/*
* if (Emgu.CV.Cuda.CudaInvoke.HasCuda)
* {
* _vehicleAttrRecognizer.SetPreferableBackend(Emgu.CV.Dnn.Backend.Cuda);
* _vehicleAttrRecognizer.SetPreferableTarget(Emgu.CV.Dnn.Target.Cuda);
* }*/
}
}
}
/// <summary>
/// Release the memory associated with this scene text detector.
/// </summary>
protected override void DisposeObject()
{
if (_textDetector != null)
{
_textDetector.Dispose();
_textDetector = null;
}
if (_ocr != null)
{
_ocr.Dispose();
_ocr = null;
}
if (_freetype != null)
{
_freetype.Dispose();
_freetype = null;
}
}
/// <summary>
/// Clear and reset the model. Required Init function to be called again before calling ProcessAndRender.
/// </summary>
public void Clear()
{
if (_textDetector != null)
{
_textDetector.Dispose();
_textDetector = null;
}
if (_ocr != null)
{
_ocr.Dispose();
_ocr = null;
}
if (_freetype != null)
{
_freetype.Dispose();
_freetype = null;
}
}